GB/T 40661-2021Calibration specification of measurement instrument for power frequency magnetic field (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document specifies the general requirements, calibration parameter requirements, calibration conditions, calibration items and calibration methods, calibration results for power frequency magnetic field measuring instruments. Requirements such as fruit, calibration interval, etc.

This document is applicable to new-manufactured, in-use, and repaired magnetic field measuring instruments that measure power frequency magnetic induction with a rated frequency of 50 Hz Calibration.

Note: Refer to Appendix A for the calibration method of the power frequency electric field measuring instrument for measuring the power frequency electric field intensity.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 17626.8 Electromagnetic compatibility test and measurement technology Power frequency magnetic field immunity test

3 Overview

The power frequency magnetic field measuring instrument is composed of a sensing unit, a signal processing and a display unit. It can be split or integral. When measuring The sensing unit is fixed at the measuring position through a bracket and a support.

Commonly used power frequency magnetic field measuring instruments are electromagnetic induction type and Hall effect type. Electromagnetic induction type is generated in the detection coil based on AC magnetic flux The principle of induced electric potential works and is suitable for measuring the magnetic field generated by a high-power source. The Hall effect type is affected by the current flow through the semiconductor material.

The principle that the magnetic field perpendicular to the surface generates voltage at both ends works, and it is suitable for measuring the magnetic field generated by various power sources.

4 General requirements

4.1 The housing of the power frequency magnetic field measuring instrument should have sufficient mechanical strength, and the combination with the bracket, support, and handle should be reliable and not loose.

4.2 The plugs and sockets used to insert the signal transmission line between the working units of the power frequency magnetic field measuring instrument should have a locking mechanism.

4.3 For measuring instrument units that use batteries, there should be an instruction to replace the battery when the battery power is low.

4.4 There should be a nameplate mark on the housing of the power frequency magnetic field measuring instrument, which includes.

---name;

---Model specifications;

---Manufacturing plant;

---Product number;

--- Error limit (can also be included in the manual);

---Sensitive direction (if not marked, it is the normal direction).